BW, Lot of interest in the cams, please put me on your list. Could you describe how the "S" cams might be different than the performance cams Hitchcocks advertises? If I can get a set of "yours" I'm wondering about other options.Thanks Much,Bill N.
Hey,Are these cam designs owned or created by you, or are they free for all? Would the profiles be available? Perhaps they can be made here in India cheaply given some effort and networking.
BW has spent years with Enfields and learnt all he has one step at a time - He does the cams for helping out fellow bullet lovers. I suggest you read up on cams and learn. I have tried some cams which were supposed to be 'performance' items. Well, they perform very well - as paper-weights !!!! . And they made my CI bike a Huge ass hunk of not-working metal. And wise advise from Ace and BW prevented me from experimenting with home-grown ideas & solutions to cams - and possibly saved my motor !
what a scuzball. BW im on the list right? I have the money just let me know when to pay!
So Paul, I apologize if I came off in a wrong way - I have no intention of being a con man, nor have I ever been.Let's move on from here.
I took it to around 90 mph with no fuss and a bit in reserve, it saw 80 mph in 4th gear with more to come, as well.
I retarded the intake 'S' cam one tooth on the Harris Scrambler and got 160 PSI compression on a hot engine, stock AVL head, stock piston, with a 30mm PWK flat-slide carburetor, throttle wide open. I don't think I lost much, if any compression by doing this.Royal Enfield people are good peopleCheers,Bill
Did you happen to have a reading of the compression prior to the change?
Thank you, Paul!Just wondering about that piston in the picture. I thought the AVL pistons were flat or dished. What is that piston?
I was wondering this too. That piston crown doesn't look familiar. It almost looks like something out of a diesel tractor.Scottie
I would be happy to comment on my views of what might be expected to happen performance-wise, regarding the different timings of the different installations of these cams, if anyone wants to hear that.
It seems to me that that the factory just picked a spring that was not quite properly spec'd for the application.
Thanks, Ace! Just for clarity, the Electra X AVL engines have a rocker ratio of 1.1:1,
Hmmm. Compatible with the UCE/Iron Barrel engine ?? Say yes !
Hi,the stock rockers do seem pretty substantial, is there scope for lightening and polishing them safely?Regards,A.
BW, The cams are the best thing for making the bike go like a bullet.I also. noticed that after putting back the BS32 carb on my bike the low rpm torque seems much improved as compared with the TM flatslide. The bike actually does power wheelie in the first if I pop the clutch. However the bike's top end has dropped with this carb. Do CV carbs help boost low end torque? Secondly, once the rpms cross 4000 the clutch starts to slip despite having stronger Endurance clutch springs installed !! Is there way to improve the AVL clutch with use of better springs or different clutch plates? I did run the bike without the oil in the primary side as a test and that stops the slip. But I don't think that is a solution. Any suggestions from AVL members with S cams will be helpful. Thanks.
Thank You for the reply Bill. Appreciate the tip on the ATF F type. I will work on the bike this weekend and clean up the clutch side before replacing the oil with ATF. Will update once I get to it.Did you have any cam-follower wearing out issues with you bike (using the AVL cam followers) ? The exhaust follower wore out so I had replaced both recently, however, it seems like the followers are again starting to wear out again. Thanks,Tej
Hi Ace, Bill, You maybe be right on with the oil - with the old cast iron engine getting phased out its getting harder to get engine oil specifically for the 'Bullet' so I have been using 20W50 which is meant for petrol car engines. Will adding an oil additive like STP help. I will definitely use a high Zinc /PH oil after I manage to replace the followers with new ones. Thank You.
BW,What octane do you use in your 500 9.2:1 compression AVL engines?Cheers,Bill
Finally, finally got around to installing the cams. Couple of hiccups: 1. For the life of me, cant find the timing marks on the pinion!! Had to mark it myself based on TDC and original cam locations.
TejK,If your clutch is adjusted correctly, try F type ATF in your primary. I use this in the Harris Scrambler and get no clutch slippage at all, pulling hard at any RPM. This on the stock clutch with over 35,000 miles on it.Royal Enfield people are good peopleCheers,Bill
........The clutch has definetly improved with the clutch engaging quite positively now. Haven't found any slip after using the ATF. I couldn't find the F type and am using the A type ATF which was available.........
Hi Dan, the timing mark on the pinion generally gets covered by the oil pump worm. You can unscrew the lock nut and you will be able to see the mark. Happy Bulleteer-ing !!Regards,Tej
My cafe avl would love some s cams
I thought you got a set...?...........
Paul - Do you have any dyno reports of Stock AVLs? Maybe Asbo 11? before the transformation?
75hp in 4th gear? Who-da-lolly that sounds nice! I have to admit, I'm a bit intimidated by the installation of them but I'm going to have to try it.This may be a "no dumb questions" dumb question but, do the cams change the air/fuel mixture at all? Is re-jetting required? At some point I'd like the TM32 that a bunch of you folks are running in your AVLs, and that Tom is running on his Fireballs. Dan, keep us posted on your tuning of the carbs.Lot of good, tempting info here. Thanks guys.
Dan, keep us posted on your tuning of the carbs.
Have you gotten into 5th yet? What is your final gearing, stock or are you geared up one tooth on your countershaft sprocket?
Quick update: beautiful day. Upper 60s. Found 5th gear, and made good progress to an indicated 85mph; could have done more I think, but the police made me stop and messed up my plug chop run. Now I gotta pay an extra bill... Gotta pay more attention to the median!Sweet spot is right around 70 in 5th at about 4000ish rpm. Very pleasant.
That all looks very promising, Dan. I remember doing the 100 MPH + runs on the machine I tuned a few years back and a little part of me would have been happy to get 'done' by the police, just to make it more 'official' B.W.
That thought crosses my mind as well when I am doing top speed runs. "Wait. Are you sure about that officer? I don't think my bike will even go that fast. Maybe we should find a better road and test to make sure your radar is working properly." Scottie J
Hey Guys, i was able to acquire a used pair of s cams from hitchcocks! I am really hazy on the installation. Is it the same installation proccess as BW's S cams?
are the "Marks" the cross on the top?
how can i clean these cams one of them has a slight rust color on one side?
So i put the S cams in today. It feels like its so much harder to push the kick start lever down. Idk why. I would love some insight on how to perfectly adjust the pushrods. its turns over and everything but it has yet to start. HELP
So i finally got my bike running put a hotter plug i found on the forums. Is there any info on anybody trying 535cc with the S cams?
i put the br6es equivalent that my local autoparts store had its a autolite 404 the thing would not start for the love of god with the 8
i appriecate any criticism and advice given please do. Im running the TM32 with stock needle in stock position with 200 main and 35 pilot. i might have a 40 pilot in it i dont remember as im running a velocity stack. ill pull it off tomorrow and take a look.
A quick question on the S cams... What would one expect to see in terms of max rpms with the s cams on a stock setup? Ballpark...Why do I ask?... I was really laying into it tonight and in both 2nd and 3rd I experienced a rev limiting phenomena. Valves bouncing? I can't say at what rpm. It was dark and I couldn't read the cheapo digi tach (magnetic pulse pickup basically). The tach records max rpm; told me 10,400 and I cannot believe that at all... Anyone else find out the top end on the s cams?
In the lower gears, it is possible to exceed safe rpm limits. At some point, the valve springs will lose control, and the valves could float, which can result in damage.I don't know how high you went, but if you plan to do more of that, it would be advised to get a better tach with a light.
The TM32 is pretty much maxxed out at 6200 rpm anyway, so there is not much point in going higher than that. It just stresses the engine more, and doesn't increase power. If you were racing, and had to hold on to a lead by revving higher to the finish line or something, that might be a reason. But for street riding, it's not really necessary.If you want 7000 rpm, you need a TM34 which is good to nearly 7000 rpm. You could use a 36 for 7200+ rpm, but that's getting into another custom manifold because our alloy manifolds do not fit the 36. And that is getting into short lifespan engine territory, especially with a stock bottom end.
Does this info vary for my build being that I am feeding 2 - 350 cylinders? I believe you said the TM32 should be good for about 6800 RPMs on my build?
6500 rpm is pretty dam hot!
Thanks all. Went out again today in the daylight. 6000 rpm is indeed when the power tops out. It'll pull till about 6500 in lower gears with no bounce. So I must have been a wee bit higher last night now I know what to listen for... Sure do like the cams! Next plan is to get the head to ace at the end of this season.